Any ideas, suggestions, or tips on writing a cookbook?

Hey guys, I'm thinking of writing a cookbook.. my reasoning.. If they can do it, why can't I? Even if I fail, at least I tried. So the opinion of culinary majors, teachers, or hopefully even publishers or cookbook authors is greatly appreciated.. even if you have to lie lol. I have about 30 original recipes, and can add plenty of more modified and tweaked recipes from basic to complex. I want to focus heavily on teaching cooking fundamentals, ingredients synopsis, and cultural food history, along with recipes that gradually increase in difficulty but still categorized and organized (I think that will help set me apart a little more than just an old cookbook that sits on top of the fridge). So basically my questions are of the type concerning making a successful cookbook.. What's a solid amount of recipes to have, should I market to a specific age group or just go broad and general, what are the first steps to getting published once it's complete, how long is the process( I can have it ready for submission in a month), Should I hire somebody for photos, or should I use my personal digital camera, How much can I expect to shell out to get my book published, and everything and anything related to writing a cookbook. Please and thank you.